iPhone/iPod Touch/Windows Mobile only: Free wireless mobile synchronization service NuevaSync has updated with full support for multiple Google calendars, including sync for read-only holiday or shared calendars.

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NuevaSync gives you over-the-air synchronization using your mobile device's built-in support for Microsoft Exchange, and acts as a pass-through gateway to your Google Calendars and Gmail contacts with support for updating directly from the device. The new updates also give you separate colors per calendar, and you can choose which calendars you don't want to synchronize.